Need a replacement catalytic converter for your 1991 Infiniti Q45? MagnaFlow offers high-quality catalytic converters engineered for 1991 Infiniti Q45 sub-models and engine sizes. We combine efficient design and state-of-the-art manufacturing to meet or exceed required emissions standards. Select your 1991 Infiniti Q45 requirements and state vehicle registration to buy the best Q45 catalytic converter online that fits your '91 Q45 and meets your state’s emissions compliance.